It depends a lot on your previous experience. If you have significant time in any trade or career with relatable skills, they can make a huge difference in your learning curve. As a specific example, I hand ground pre-hardened tool bits on grinders and belt sanders for a good 15 years before I made my first knife, and I feel it made a huge difference in my starting grind quality.
I used to build and repair musical instruments as a hobby a while back, and that really helped me with handles, but I still had to learn the forms that are specific to knifemaking.
Something I hadn't done before, like fitting and seating guards, I had to learn a bit more the hard way, but my previous experience still helped.